Improvement in boher-sorapeks



, BoiZer- Scraper- 75532 5 Pa Zen Zed 122.28, /56

. glinitrh 'tstts isms: @ffi-tt- AUGUSTE POIREL, OF NEW YORK, N. ASSIGNOR TO HIiVISELF AND PIERRE BERNARD, OF SAME PLACE.

Letters Patent No. 73,832 dated January 28, 1868.

IMPROVEMENT In BOILER-SGRAERS.

TO ALL WHOM IT MAY CONCERN .Be it known that I, Aceosrn Forum, of thecity, county, and State of New York, have invented a new and improvedBoiler-Scraper; and I do hereby declare that the following is a full,clear, and exact description thereof, which will enable others skilledin the art to make and usethe same. 7

V Figure 1 represents a side elevation, partially in section, of myimproved boiler-scraper.

Figure Sis a transverse section of the same, the planeof section beingindicated by the line a: x, fig. 1

Similar letters of reference indicate corresponding parts. I

This invention'relates to a new device for cleaning boiler-tubes, andconsists in arranging a. series of disks upon a straight bar, said disksbeing held at suitable distances apart by means of washers interposedbetween them.

The diameter of the end disk which first entersthc tube is smaller thanthat of the tube, and the diameter of the next disk is somewhat largerthan thut'of the first, and thus the disks graduallybecomo-larger towardthe handle, until the diameter of the tube is reached. Thence the disksagain become smaller toward the v handle. The object of thesegraduations in the size of the disks is to give each disk asha-re of thework. The first-disk clears the tube of a small layer of incrustrution,the second takes of! another layer, and so forth, until the largest diskclears the whole interior of the tube. If the disks hadall the samediameter as the tube, the first diskwould meet with'such resistance thatthe device could not be pushed through the tube. The

diminishing of the disks from the' largest disk towards the handle isnot absolutely necessary, but is advisable,- for the pnrposeoffacilitating the withdrawalof the scraper from the tube, and to allowthe removal of any impurities that might have remained in the tubebehind the scraper.

The invention also consists in perforating some of the disks, so thatthey may be elastic, to make them yield to inequalities in the innerside of the tube.

' A represents a straight rod, having a fixed shoulder, a, near. oneend, and a screw-thread upon each end.

B B B &c., are a seriesof annular disks, fitted upon the rod A, and C CC, &c., are washers drawn upon the rod A, and interposed between thedisks B, as shown, The disk B is placed upon the rod A, against theshoulder a, then the washer O is put on, then the disk B, Washer O, andso forth, until'the last disk, B or the last washer, is held in positionby means of a nut or headed screw, 6, as shown. The front disk, B issmaller in diameter than thenext disk, B, an d this is smaller againthan the disk 13 the disk B being the largest, and of equal diameterwith the tube to be cleaned. The disk B is again smaller than B, and Bis still smaller than B ,.as is clearly shown in fig. l, and forthe'purpose above set forth.

The disks can be easily removed and replaced by others, so that thedevice can be adapted to tubes of irarious diameters. The largest diskBmay be perforated, as shown in fig. 2, so as to be elastic, to yield tothe inequalities in the interior of the tube. The rod A is screwed orotherwise fastened to a suitable handle D, as shown. The number of disksmay be varied at'plcasure I do not claim broadly the disks, nor themethod heroin desci'ibed of attaching them to the rod, as I am awarethat this is not new; but having thus described my invention, I

What I claim as new, and desire to secure by Letters Patent, is-

I. The construction of the metallic scraping-disks, of unequaldiameters, arranged upon the same rod, whereby each disk will perform aportion of the work without permitting the front disk alone to scrapethe tube, as herein shown and described.

2. The construction of the metallic disks, with perforations, to givethem elasticity, whereby obstructions in the tube will not prevent theoperation of the scraper, as herein shown and'described.

,AUGUSTE POIREL. Witn esses 1 WM. F. MCNAMARA, ALEX. F. Ronnnrs,

